Rotary pump.



PATENTBD DB0. a, 1903.4 H. o. EVANS. ROTARY` PUMP. APPLICATION FILEDJUNE 6,1903.

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Patented December 81, 1903.

v UNITED STATES PATENT OFFICE.

HENRY O. EVANS, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO NATIONALSPECIALTY MANUFACTURING COMPANY, OF PHILADEL- PHIA, PENNSYLVANIA, AFIRM.

ROTARY PU M P.

SPECIFICATION forming part of Letters Patent No. 746,482, dated December8, 1903.

- Application led June 6, 1903.- Serial No. 160.284. (No model.)

.To all whom it may concern:

Be it known that I, HENRY O. EVA-NS, a citizen of the United States,residing in the city and county of Philadelphia, State of Pennsylvania,have invented a new and useful Improvem ent in RotaryPumps, of which thefollowing is a specification.

f My invention relates to rotary pumps such as are used in barrels orlike receptacles.

It consists of means for insuring the delivery of ardeiinite quantity ofliquid by such pump without regard to the ullage of the barrel.

It further consists of novel details of construction, all as will behereinafter set forth.

Figures 1 and 2 represent vertical sections, at right angles to eachother, of a pump embodying my invention. Figs. 3, 4, 5, and 6 representhorizontal sections on the lines and in the directions indicated. Fig. 7represents a bottom plan view of the device.

Similar numerals of reference indicate corresponding parts in thefigures.

Referring to the drawings, 1 designates a casing having at its upperoffset end an aperture 2 for connection with a pump-tube 3 and a secondaperture 4, provided with a stuffingbox 5, through which passes a rod 6.An abutment 7 in the casing 1 divides the casing into discharge and pumpchambers 8 and 9, connected by a semicrescent-shaped passage 10. Throughthe abutment 7 is an eccentrically-disposed cylindric opening 11,adapted to serve as a bearing for the reduced upper portion 12 of apiston 13. In the portion 12 is a recess 14, adapted to receive theshaved end 15 of the rod 6. Slots 16 through the body of the piston 13are filled by blades 17, adapted to move snugly therethrough and tocontact with the wall of the chamber 9. The base of the pump-chamber 9is formed by a plate 18, having a peripheral recess 24,adapted to engagea pin 25in the wall of the casing 1. A semicrescent-shaped passage 19 isformed between the edge of the plate 18 and the wall of the casing, thedirection of its widening being the reverse of that of the passage 10. Acylindric foot portion 2O screws into the lower end of the casing 1,forming the lower or suction chamber 22, and may have the ortion 20.

The operation is as follows: It will be understood that the device shownwhen in use ,is plunged to the bottom of a barrel of molasses, oil, orother liquid, that the pump-tube 3 and rod 6 extend out of the top ofthe barrel7 and they are there provided with a suitable pump-spout andmeans for rotating the rod. As these features are well known in the artand form, per se, no part of my invention, I have not deemed itnecessary to illustrate Aor further describe them. It will be seen thateach rotation of the rodi 6 turns the blade 17 in the chamber 9, theblades sliding smoothly through the slots 16 in the eccentrically-placedpiston 13, the edges of the blades sweeping the walls of the chamber.Successive rotations of the rod will draw the liquid in the barrelthrough the foot-valve 23 into the suction-chamber 22 through thepassage 19 into the pumpchamber 9, thence force it through the passage10 into the discharge-chamber 8 and upward through the pump-tube 3. Thefoot-valve 23 will always act to prevent any return flow of the liquid,so that the casing 1 and tube 3 will after the rst operation be keptfull of the liquid up to the level of the discharging-point. This adaptsmy device for use with means for counting and registering the rotationsof the rod 6, by which means the volume cf liquid delivered may bemeasured. As such means form no part of the present invention, they arenot here illustrated.

It is desirable that the diameter of the casing 1 be as small as isconsistent with requisite capacity, so that the ordinary bung-hole ofthe barrel need not be'enlarged. By offsetting the upper portion of thecasing, as shown, I amable to center the rod 6 in the piston 13 withoutbulging the casing or increasing its size.

It is evident that various changes may be made by those skilled in theart which may come within the scope of my invention, and I do not,therefore, desire to be limited in every instance to the exactconstruction herein shown and described.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

l. A rotary barrel-pump provided at its lower end with a cylinder havingsubstantially straight sides and with an offset portion above saidcylindric portion, the greatest transverse diameter of which is notsubstantially greater than the diameter of said cylindric portion, saidoffset portion having an aperture for the insertion of a pump-tube and asecond aperture adapted to pass a rotary rod.

2. In a rotary barrel-pump provided at its lower endwith a cylindriccasing having substantially straight sides and with an offset por- .tionabove said cylindric portion the greatest transverse dimension of whichis not substantially greater than the diameter of said cylindricportion, a pump-tube connected with said plate dividing said casing intoa plurality of chambers, passages between said chambers and plate, and apiston between said abutment and said plate. Y

3. In a rotary barrel-pump provided at its lower end with a cylindriccasing having substantially straight sides and with an offset portionabove said cylindric portion, the greatest transverse dimension of whichis not substantially greater than the diameter of said cylindricportion, a pump-tube connected to the upper end of said offset portion,a rotary rod exterior of said tube and passing into the upper end ofsaid offset portion, an abut- `ment and a plate dividing said casinginto chambers, passages between said abutments and plate and the wall ofsaid casing, an eccentrically-placed piston forming part of the wall ofsaid passages and blades movable in said piston.

HENRY O. EVANS.

Witnesses:

JOHN A. WIEDERSHEIM, E. HAYWARD FAIRBANKS.

